[PATCH] OMAP4: I2C: Enable FIFO usage for OMAP4
From: Shubhrajyoti D <hidden>
Date: 2011-11-03 15:17:08
Also in:
linux-i2c, linux-omap
Subsystem:
i2c subsystem, i2c subsystem host drivers, omap i2c driver, omap1 support, omap2+ support, the rest · Maintainers:
Andi Shyti, Vignesh R, Aaro Koskinen, Janusz Krzysztofik, Andreas Kemnade, Kevin Hilman, Roger Quadros, Tony Lindgren, Linus Torvalds
Currently the fifo depth is set to zero for OMAP4 which disables the FIFO usage. This patch enables the FIFO usage for I2C transactions on OMAP4 also. Tested on omap4430 and 3430. Tested-and-Reported-by: Nishanth Menon [off-list ref] Signed-off-by: Shubhrajyoti D <redacted> --- drivers/i2c/busses/i2c-omap.c | 11 ++++++----- 1 files changed, 6 insertions(+), 5 deletions(-)
diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
index a43d002..fa23faa 100644
--- a/drivers/i2c/busses/i2c-omap.c
+++ b/drivers/i2c/busses/i2c-omap.c@@ -1047,13 +1047,14 @@ omap_i2c_probe(struct platform_device *pdev) * size. This is to ensure that we can handle the status on int * call back latencies. */ - if (dev->rev >= OMAP_I2C_REV_ON_3530_4430) { - dev->fifo_size = 0; + + dev->fifo_size = (dev->fifo_size / 2); + + if (dev->rev >= OMAP_I2C_REV_ON_3530_4430) dev->b_hw = 0; /* Disable hardware fixes */ - } else { - dev->fifo_size = (dev->fifo_size / 2); + else dev->b_hw = 1; /* Enable hardware fixes */ - } + /* calculate wakeup latency constraint for MPU */ if (dev->set_mpu_wkup_lat != NULL) dev->latency = (1000000 * dev->fifo_size) /
--
1.7.1